Astrophysics (index)

Milky Way

(our galaxy)

The Milky Way is a Spiral Galaxy in which we reside and appears in the night sky as a glowing band. The Galaxy is on the order of 100,000 light-years in diameter, about 1000 light-years in thickness and has 200-400 billion stars. Its mass is about a trillion solar masses. The solar system is about half way between its center and its edge. It is the second largest galaxy in the Local Group (LG), the largest being Andromeda (M31).

The Sun's orbit is about 200 million years. The Milky Way's oldest stars are about 13 billion years old.


(galaxy,Local Group,local)
http://en.wikipedia.org/wiki/Milky_Way

Referenced by:
Astronomical Quantities
Bar
BICEP2
Canis Major Dwarf Galaxy
Carbon (C)
Cosmic Optical Background (COB)
Cosmic Distance Ladder
Council Of Giants
Cosmic X-Ray Background (CXB)
Dwarf Galaxy
Event Horizon Telescope (EHT)
Filament
Gaia
Galactic Binary
Galactic Center
Galactic Plane
GALAH
Galaxy
Galaxy Group
Galaxy Main Sequence
Galactic All-Sky Survey (GASS)
Globular Cluster (GC)
HabEx
Hierarchical Assembly of Galaxies
Hot DOG
Hubble Constant (H0)
Hubble Ultra-Deep Field (HUDF)
High-Velocity Cloud (HVC)
Hypervelocity Star (HVS)
IC 342
Interstellar Magnetic Field (ISMF)
Jansky (Jy)
Kinematic Distance
LAMOST
Laniakea Supercluster
Large Magellanic Cloud (LMC)
Local Group (LG)
Local Sheet
Local Standard of Rest (LSR)
Local Volume (LV)
Andromeda (M31)
Triangulum Galaxy (M33)
Mimir
Multiplicity Fraction
Milky Way Chemical Evolution
NASA/IPAC Extragalactic Database (NED)
Nova
Omega Centauri
Open Cluster
Oxygen (O)
Red Dwarf
Sagittarius Dwarf Elliptical Galaxy (Sgr dE)
Satellite Galaxy
Scutum-Centaurus Arm
Sloan Digital Sky Survey (SDSS)
Supermassive Black Hole (SMBH)
Small Magellanic Cloud (SMC)
Spectral Line
Spiral Galaxy
Spitzer Space Telescope (SST)
Starburst Galaxy
Stellar Distance Determination
Stellar Population
Sun
Supercluster
21cm Line
Triangulum II (Tri II)
Two Micron All-Sky Survey (2MASS)
Ultra-Faint Dwarf Galaxy (UFD)
Virgo
Westerhout Radio Survey (W)
Wolf-Rayet Star

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